I agree, it's not something to throw around lightly. I might be misinterpreting your message, but I don't believe I called all the users of an instance nazis (in this case, I guess we'd be taking about sh.it.just.works). I realise in a comment lower in the thread, they say "defederating from exploding heads", but that's not exactly correct because that's a community, not an instance. I am not calling all sh.it.just.works users nazis, and I'm not calling all exploding heads users nazis either. It's just that that sort of community tends to attract some nazis, so I would say that exploding heads would attract and retain a higher number of nazis than other communities.

What I did say, regarding the stadium metaphor, is that instead of having a stadium with a comfy corner of hate for nazis (a community in an instance that facilitates such people and behaviour, which could seep into the rest of the instance and other instances), if you defederate, it would make the whole stadium more comfortable because there isn't a corner with nazis (which would make it more inviting for other people to visit. Who would want to visit a stadium with a corner for nazis?). It would mean that the non-nazi people of that instance would also be moved to their own stadium with the small group of nazis, but they are free to create an account on another instance if they want to move. That's the power of Lemmy; you can find an instance that aligns with your values and join that.

Okay the more I write in this stadium metaphor the more I realise it's harder to make it make sense haha, I hope this makes some sense